Heres a concept of my car as an Autobot, in the movie style. I like to draw it alot more compared to the usual TF style we have been getting. Anyways, did this a couple weeks ago. I haven't nailed down the exact design yet, so its still a work in progress. For the head, I'll probally end up with a design that looks close to the first head at the top.

Love the design. It fits right in with everything we've seen for the movie. It would look great on the big screen.
The top head design, or the on under it, though seem like the best fit for this bot.
Also, I'm getting a bit of a BW Rampage vibe from the bottom head design.